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    <h1 class="post-title">
      Element el-upload上传组件详解
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    <h2 id="前言"><a href="#前言" class="headerlink" title="前言"></a>前言</h2><p>upload上传是前端开发很常用的一个功能，在Vue开发中常用的Element组件库也提供了非常好用的upload组件。</p>
<h2 id="基本用法"><a href="#基本用法" class="headerlink" title="基本用法"></a>基本用法</h2><p><strong>代码：</strong></p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-upload</span> <span class="token attr-name">:action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadActionUrl<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-button</span> <span class="token attr-name">size</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>small<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>点击上传<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-button</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-upload</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span></span></code></pre>
<p>这个基本不用说，:action是执行上传动作的后台接口，el-button是触发上传的按钮。</p>
<h2 id="上传文件数量"><a href="#上传文件数量" class="headerlink" title="上传文件数量"></a>上传文件数量</h2><p>首先是设置是否可以同时选中多个文件上传，这个也是&lt;input type=’file’&gt;的属性，添加multiple即可。另外el-upload组件提供了:limit属性来设置最多可以上传的文件数量，超出此数量后选择的文件是不会被上传的。:on-exceed绑定的方法则是处理超出数量后的动作。代码如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-upload</span> 
    <span class="token attr-name">:action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadActionUrl<span class="token punctuation">"</span></span>
    <span class="token attr-name">multiple</span>
    <span class="token attr-name">:limit</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>3<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-exceed</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>handleExceed<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-button</span> <span class="token attr-name">size</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>small<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>点击上传<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-button</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-upload</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="上传格式及大小限制"><a href="#上传格式及大小限制" class="headerlink" title="上传格式及大小限制"></a>上传格式及大小限制</h2><p>如果需要限制上传文件的格式，需要添加accept属性，这个是直接使用&lt;input type=’file’&gt;一样的属性了，accept属性的值可以是accept=”image/gif, image/jpeg, text/plain, application/pdf”等等。文件格式的提示，则可以使用slot。代码如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-upload</span> 
    <span class="token attr-name">:action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadActionUrl<span class="token punctuation">"</span></span>
    <span class="token attr-name">accept</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image/jpeg,image/gif,image/png<span class="token punctuation">"</span></span>
    <span class="token attr-name">multiple</span>
    <span class="token attr-name">:limit</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>3<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-exceed</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>handleExceed<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-button</span> <span class="token attr-name">size</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>small<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>点击上传<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-button</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">slot</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>tip<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>el-upload__tip<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>请上传图片格式文件<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-upload</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>注意这里只是选择文件时限制格式，其实用户还是可以点选“所有文件”选项，上传其他格式。如果需要在在上传时再次校验，择需要在:before-upload这个钩子绑定相应的方法来校验，代码如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-upload</span> 
    <span class="token attr-name">:action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadActionUrl<span class="token punctuation">"</span></span>
    <span class="token attr-name">accept</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image/jpeg,image/gif,image/png<span class="token punctuation">"</span></span>
    <span class="token attr-name">:before-upload</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>onBeforeUpload<span class="token punctuation">"</span></span>
    <span class="token attr-name">multiple</span>
    <span class="token attr-name">:limit</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>3<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-exceed</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>handleExceed<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-button</span> <span class="token attr-name">size</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>small<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>点击上传<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-button</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">slot</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>tip<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>el-upload__tip<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>请上传图片格式文件<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-upload</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token function">onBeforeUpload</span><span class="token punctuation">(</span><span class="token parameter">file</span><span class="token punctuation">)</span>
<span class="token punctuation">&#123;</span>
    <span class="token keyword">const</span> isIMAGE <span class="token operator">=</span> file<span class="token punctuation">.</span>type <span class="token operator">===</span> <span class="token string">'image/jpeg'</span><span class="token operator">||</span><span class="token string">'image/gif'</span><span class="token operator">||</span><span class="token string">'image/png'</span><span class="token punctuation">;</span>
    <span class="token keyword">const</span> isLt1M <span class="token operator">=</span> file<span class="token punctuation">.</span>size <span class="token operator">/</span> <span class="token number">1024</span> <span class="token operator">/</span> <span class="token number">1024</span> <span class="token operator">&lt;</span> <span class="token number">1</span><span class="token punctuation">;</span>

    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>isIMAGE<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>$message<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">'上传文件只能是图片格式!'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>isLt1M<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>$message<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">'上传文件大小不能超过 1MB!'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">&#125;</span>
    <span class="token keyword">return</span> isIMAGE <span class="token operator">&amp;&amp;</span> isLt1M<span class="token punctuation">;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>这里在限制文件格式的同时，也做了文件大小的校验。</p>
<h2 id="上传过程中的各种钩子"><a href="#上传过程中的各种钩子" class="headerlink" title="上传过程中的各种钩子"></a>上传过程中的各种钩子</h2><p>这里直接搬运官网的说明了，如图：</p>
<p><img  srcset="data:image/svg+xml,%3Csvg%20xmlns='http://www.w3.org/2000/svg'%20viewBox='0%200%20300%20300'%3E%3C/svg%3E" data-src="https://api2.mubu.com/v3/document_image/8d3bf50a-0348-40d6-abce-df7606f40d9b-3807603.jpg" class="lozad post-image"src="https://api2.mubu.com/v3/document_image/8d3bf50a-0348-40d6-abce-df7606f40d9b-3807603.jpg"></p>
<h2 id="显示已上传文件列表"><a href="#显示已上传文件列表" class="headerlink" title="显示已上传文件列表"></a>显示已上传文件列表</h2><p>这个功能可以说很强大了，可以很清晰的显示已上传的文件列表，并且可以方便的删除，以便上传新的文件。<br>代码：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-upload</span> 
    <span class="token attr-name">:action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadActionUrl<span class="token punctuation">"</span></span>
    <span class="token attr-name">accept</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image/jpeg,image/gif,image/png<span class="token punctuation">"</span></span>
    <span class="token attr-name">multiple</span>
    <span class="token attr-name">:limit</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>3<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-exceed</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>handleExceed<span class="token punctuation">"</span></span>    
    <span class="token attr-name">:on-error</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadError<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-success</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadSuccess<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-remove</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>onRemoveTxt<span class="token punctuation">"</span></span>
    <span class="token attr-name">:before-upload</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>onBeforeUpload<span class="token punctuation">"</span></span>
    <span class="token attr-name">:file-list</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>files<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-button</span> <span class="token attr-name">size</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>small<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>点击上传<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-button</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">slot</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>tip<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>el-upload__tip<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>请上传图片格式文件<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-upload</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<p>实现方法就是:file-list=”files”这个属性的添加，其中files是绑定的数组对象，初始为空。</p>
<h2 id="上传时提交数据"><a href="#上传时提交数据" class="headerlink" title="上传时提交数据"></a>上传时提交数据</h2><p>上传文件同时需要提交数据给后台接口，这时就要用到:data属性。</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-upload</span> 
    <span class="token attr-name">:action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadActionUrl<span class="token punctuation">"</span></span>
    <span class="token attr-name">accept</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image/jpeg,image/gif,image/png<span class="token punctuation">"</span></span>
    <span class="token attr-name">:data</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadData<span class="token punctuation">"</span></span>
    <span class="token attr-name">multiple</span>
    <span class="token attr-name">:limit</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>3<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-exceed</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>handleExceed<span class="token punctuation">"</span></span>    
    <span class="token attr-name">:on-error</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadError<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-success</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>uploadSuccess<span class="token punctuation">"</span></span>
    <span class="token attr-name">:on-remove</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>onRemoveTxt<span class="token punctuation">"</span></span>
    <span class="token attr-name">:before-upload</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>onBeforeUpload<span class="token punctuation">"</span></span>
    <span class="token attr-name">:file-list</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>files<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-button</span> <span class="token attr-name">size</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>small<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>点击上传<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-button</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">slot</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>tip<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>el-upload__tip<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>请上传图片格式文件<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-upload</span><span class="token punctuation">></span></span>
<span class="token comment">&lt;!--
uploadData: &#123;
    dataType: "0",
    oldFilePath:""
&#125;
--></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="选取和上传分开处理"><a href="#选取和上传分开处理" class="headerlink" title="选取和上传分开处理"></a>选取和上传分开处理</h2><p>有时我们需要把选取和上传分开处理，比如上传图片，先选取文件提交到前端，图片处理后再把base64内容提交到后台。<br>代码如下：</p>
<pre class="line-numbers language-html" data-language="html"><code class="language-html"><span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-upload</span>
  <span class="token attr-name">action</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token punctuation">"</span></span>
  <span class="token attr-name">accept</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>image/jpeg,image/png<span class="token punctuation">"</span></span>
  <span class="token attr-name">:on-change</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>onUploadChange<span class="token punctuation">"</span></span>
  <span class="token attr-name">:auto-upload</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>false<span class="token punctuation">"</span></span>
  <span class="token attr-name">:show-file-list</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>false<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-button</span> <span class="token attr-name">slot</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>trigger<span class="token punctuation">"</span></span> <span class="token attr-name">size</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>small<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>primary<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>选取<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-button</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>el-button</span> <span class="token style-attr"><span class="token attr-name">style</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span><span class="token style language-css"><span class="token property">margin-left</span><span class="token punctuation">:</span> 10px<span class="token punctuation">;</span></span><span class="token punctuation">"</span></span></span> <span class="token attr-name">size</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>small<span class="token punctuation">"</span></span> <span class="token attr-name">type</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>success<span class="token punctuation">"</span></span> <span class="token attr-name">@click</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>submitUpload<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>上传<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-button</span><span class="token punctuation">></span></span>
    <span class="token tag"><span class="token tag"><span class="token punctuation">&lt;</span>div</span> <span class="token attr-name">slot</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>tip<span class="token punctuation">"</span></span> <span class="token attr-name">class</span><span class="token attr-value"><span class="token punctuation attr-equals">=</span><span class="token punctuation">"</span>el-upload__tip<span class="token punctuation">"</span></span><span class="token punctuation">></span></span>只能上传jpg/png文件，且不能超过1m<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>div</span><span class="token punctuation">></span></span>
<span class="token tag"><span class="token tag"><span class="token punctuation">&lt;/</span>el-upload</span><span class="token punctuation">></span></span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>
<pre class="line-numbers language-javascript" data-language="javascript"><code class="language-javascript"><span class="token function">submitUpload</span><span class="token punctuation">(</span><span class="token punctuation">)</span>
<span class="token punctuation">&#123;</span>
  console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token string">"submit"</span><span class="token punctuation">)</span>
<span class="token punctuation">&#125;</span><span class="token punctuation">,</span>
<span class="token function">onUploadChange</span><span class="token punctuation">(</span><span class="token parameter">file</span><span class="token punctuation">)</span>
<span class="token punctuation">&#123;</span>
  <span class="token keyword">const</span> isIMAGE <span class="token operator">=</span> <span class="token punctuation">(</span>file<span class="token punctuation">.</span>raw<span class="token punctuation">.</span>type <span class="token operator">===</span> <span class="token string">'image/jpeg'</span> <span class="token operator">||</span> file<span class="token punctuation">.</span>raw<span class="token punctuation">.</span>type <span class="token operator">===</span> <span class="token string">'image/png'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  <span class="token keyword">const</span> isLt1M <span class="token operator">=</span> file<span class="token punctuation">.</span>size <span class="token operator">/</span> <span class="token number">1024</span> <span class="token operator">/</span> <span class="token number">1024</span> <span class="token operator">&lt;</span> <span class="token number">1</span><span class="token punctuation">;</span>

  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>isIMAGE<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>$message<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">'只能上传jpg/png图片!'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>isLt1M<span class="token punctuation">)</span> <span class="token punctuation">&#123;</span>
    <span class="token keyword">this</span><span class="token punctuation">.</span>$message<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">'上传文件大小不能超过 1MB!'</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">return</span> <span class="token boolean">false</span><span class="token punctuation">;</span>
  <span class="token punctuation">&#125;</span>
  <span class="token keyword">var</span> reader <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">FileReader</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
  reader<span class="token punctuation">.</span><span class="token function">readAsDataURL</span><span class="token punctuation">(</span>file<span class="token punctuation">.</span>raw<span class="token punctuation">)</span><span class="token punctuation">;</span>
  reader<span class="token punctuation">.</span><span class="token function-variable function">onload</span> <span class="token operator">=</span> <span class="token keyword">function</span><span class="token punctuation">(</span><span class="token parameter">e</span><span class="token punctuation">)</span><span class="token punctuation">&#123;</span>
      console<span class="token punctuation">.</span><span class="token function">log</span><span class="token punctuation">(</span><span class="token keyword">this</span><span class="token punctuation">.</span>result<span class="token punctuation">)</span><span class="token comment">//图片的base64数据</span>
  <span class="token punctuation">&#125;</span>
<span class="token punctuation">&#125;</span><span aria-hidden="true" class="line-numbers-rows"><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span><span></span></span></code></pre>

<h2 id="参考链接"><a href="#参考链接" class="headerlink" title="参考链接"></a>参考链接</h2><p><a target="_blank" rel="noopener" href="https://segmentfault.com/a/1190000013796215">Element el-upload上传组件详解</a></p>

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